达契亚盆地(副特提斯东部)的中新世-上新世过渡:庞蒂地区阶段的古地磁、软体动物、微动物和沉积相

IF 1.6 4区 地球科学 Q2 PALEONTOLOGY Geobios Pub Date : 2023-04-01 DOI:10.1016/j.geobios.2023.03.002
Anton Matoshko , Arjan de Leeuw , Marius Stoica , Oleg Mandic , Iuliana Vasiliev , Alina Floroiu , Wout Krijgsman
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引用次数: 1

摘要

详细记录的、高分辨率的沉积剖面对于我们理解在大陆-大陆融合的最后阶段形成的半孤立盆地的经常发生的演化至关重要,例如地中海-帕拉提提斯系统。由于它在中新世晚期几乎是内陆的位置,地中海经历了著名的墨西尼亚盐危机。与此同时,同样受限制的东帕拉提亚人在东北部以一种可能相关但非常独特的方式进化。这一时期的事件在东帕拉提斯的一部分达契亚盆地本田区域阶段沉积的沉积物中得到了完整的记录,我们在这里用最好的剖面对其进行了详细的研究。研究的slilnicul - de buzuru剖面厚度超过2 km,几乎连续暴露。对古地磁、软体动物、微动物群和沉积相进行了分析。这使我们能够改进以前从附近但不太完整的剖面得到的结果,特别是在分辨率、生物地层学和沉积学方面的改进。在庞天高地底部下方的海洋入侵(6.1 Ma)明显早于早期庞天高地。生物地层学上定义的中庞天(6.0 Ma)的起始与高地重合,略早于中庞天最著名的主要回归(5.9-5.6 Ma)。在本研究剖面中,晚本天期(5.6 Ma)海侵开始后,在中新世-上新世界线(5.33 Ma)附近出现5.4 ~ 5.2 Ma的海侵退行趋势。晚期庞天沉积相对稳定,动物群逐渐过渡(4.8 Ma)为达契亚盆地的达契亚期特征组合,整体上与东帕拉提伊斯其他地区明显分化。最后,我们讨论了可能影响更新年代地层学的准确性和适用性的几个因素,需要谨慎。
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The Mio-Pliocene transition in the Dacian Basin (Eastern Paratethys): Paleomagnetism, mollusks, microfauna and sedimentary facies of the Pontian regional stage

Well-documented, high-resolution sedimentary sections are critical to our understanding of the often eventful evolution of semi-isolated basins that form during the final stages of continent–continent convergence, as exemplified by the Mediterranean-Paratethys system. Due to its nearly land-locked position in the Late Miocene, the Mediterranean experienced the renowned Messinian Salinity Crisis. At the same time, the equally restricted Eastern Paratethys to the north-east evolved in a potentially related, but very distinctive way. The events of this period are fully recorded in the sediments deposited during the Pontian regional stage in the Dacian Basin, part of the Eastern Paratethys, which we here investigate in detail in the best available section. The studied interval of the Slănicul de Buzău section is more than 2 km thick and almost continuously exposed. It is analyzed for paleomagnetism, mollusks, microfauna and sedimentary facies. This allows us to refine previous results from nearby but less complete sections, with particular improvements concerning resolution, biostratigraphy and sedimentology. The marine incursion just below the base of the Pontian (6.1 Ma) is shown to significantly predate the early Pontian highstand. The biostratigraphically defined onset of the middle Pontian (6.0 Ma) coincides with the highstand and slightly predates the major regression (5.9–5.6 Ma) for which the middle Pontian is best known. In the here-investigated section, the transgression at the beginning of the late Pontian (5.6 Ma) is followed by a regressive trend culminating between 5.4 and 5.2 Ma around the Mio-Pliocene boundary (5.33 Ma). The late Pontian sedimentation then becomes relatively stable and the fauna gradually transitions (4.8 Ma) into assemblages characteristic for the Dacian stage of the Dacian Basin, while overall significantly diverging from the rest of the Eastern Paratethys. Finally, we discuss several factors that could affect accuracy and applicability of the updated chronostratigraphy, warranting some caution.

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来源期刊
Geobios
Geobios 地学-古生物学
CiteScore
3.30
自引率
6.20%
发文量
28
审稿时长
6-12 weeks
期刊介绍: Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.
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